Successful Defibrillation After Conversion From Fixed‐Tilt to Tuned‐Duration Waveform

Fixed-tilt biphasic shocks may become ineffective in high-impedance states because phase-2 over-prolongation disrupts optimal charge neutralization. Waveform tuning based on membrane time constants, as implemented by DeFT Response, shortens phase durations to physiologic ranges and lowers the defibrillation threshold. This mechanism-based strategy may enhance the reliability of ICD therapy in patients with rising impedance or high DFTs.